Inner tube for pneumatic tires.



* rr@ STATES Re errent,

1 cHAnLnsn. nnwnon ein) JOHN H. HEITMANN, or sr. LOUIS, MISSOURI.

vIIYNTEZR, TUBE FOR PN EUMATIC TIRES.

temeer.

ySpecification of Letters Patent.

resented sept.' if?, 191e.

Application filed october 1, 1917. Serial No. 194,187.

'To all 'whom t may concern:

Pneumatic Tires, of .which the following is HERMANN, citizens of the United States, residing and .useful Improvementsin Inner Tubes for a full, clear,'and exact description, reference l Adirected to the "when being 4had to the accompanying drawings,- ,110

forming a part hereof. i

The present improvement is particularly' constructiony of' the inner tube Lof pneumatio'tires, and "has forl itsgobject to providean inflatable' tube which shall be practically puncture-proof; one whose walls' are' susceptible vof, readily yielding forced'inwardly 4by sharp objects such as nails, tacks, ,and the' like which have venebeing p trated the outer casing, .'20

such yielding eing permitted byv reason of the fact that certain layers entering the construction'of the tube are :disconnected from adjacentlayers dis-' posed exteriorly thereto, 'the inner layers V eferably. protected by a 'distinct 'layer-not readily p'enetrable by nails, tacks,

and the like. In the present embodiment of lou-r invention .the dilatablef'rubbervmeml -lfrallle of the tube is confined to al predetermined portion of the-crossesection' of\ the tube, 'said portion lying adjacent the metal prim ofthe Wheel, with which it is kept from coming in direct Contact by a suitable flap of canvas, or duck, or covering saiddilatable membrane and .inter- 3 5-.posed between it and the felly `rim aforeequivalent material said. ()ur improved inner tube possesses de'- -cided advantages .which will be fully apparent from the following detailed description 1n connection with-theaccompanying drawing in Whichi Figure 1'- represents a cross-section of an inflatedA pneumatic tire with, our invention applied thereto, the outer casing of the tire,

the wheelriin and felly being shown dotted; Fig. 2 is a side elevation of the inflatable tube with lparts broken away; and Fig. 3 is an inner edge view of the inflatable tube, v--tllat is to say, looking radially outward from the felly, and R, the rim of the wheel to curedf These features'loeing old the saine the axis ofthe tire or of the wheel on Wli'ieh [the same' is fmounted," parts being breken*- v-away. I

Referring to the drawings-F represents whchfthe outer casing C ofv the tire is sel I l at St, Louis, State. of 'M1ssour1, have invented certain newv lthe wheel comprises a comparativelyA thick l are .shown dotted., the present inven n be; Be rt known that pve, CHARLES R. RAWDoN and ,JOHN H.

lfla'ta-v Said inner'. tubeis composedof a section facing the rim of the wheel,

ing concerned solely vwith the inner ble tube.. dilatable and a non-dilatablesection facing the tread 6o such as duck, canvas, silk and the like, which f 65 may be of single or multiple ply; Interiorly of said layer 1 and loose therefrom is disposeda nonpuncturable yielding,v liable layer 2 preferably of chrome leather, t e said layer 2 being cemented to an inner layer 3-` of Woven fabric; on the order of the layer 1, the sides of vthe layer 3 overlapping jectingbeyond the sides of the layerl 2, and the sides of the l'ayer 1 projecting beyond the side' edges of the layer. Disposed on the inner face of the layer 8 and adhering thereto is a rubber layer or liner t the sides wheref of .project beyond or overlap the side edges of the layer 3, and beingthemselves over.-

lapped by the sides of the layer -1. The dilatable section or that facing the. rim of sheet or layer ofrubber 5 on the order usu-V ally employed for the conventional inner inflatable tube, said layer being prevented from coming in direct contact with (and un; desirable adhesion to) the metal surface of .the rim R by a woven fabric Hap or sheet 6 loose from the rubber layer 5, the side edges of saidA flap being cemented or otherwise secured to the adjacent side edges of the sheet or layer-1, the united edges of the re# l spective sheets` being overlapped substan- V tially as shown in the drawings (Figui).

The layer 2 being loose from the layer 1 and being itself practically"non-puncturable .95

by the ordinary tackv or nail, it follows that. when. such a-nail n penetrates the outer casing CV and the outer layer 'l of the non-dilatable sectionof the inner tube, Ithepoint of the nail willsimply force the layer Qand l100` subsequent layers inwardly ('Fig. l) 4Without injury to vsaid layers, the layer 2 being loose fromthe outer layer 1 readily separat'- ingfromsaid outer layerunder the circumstances referred to.

are placed in abutting-relation te thecor'- 1195 1.05 n the presentlembodinri'ent of our 'invenresponding edges of the layer 2, the-thickness of the sides ofisaid sheet 5 being somewhat' reduced adjacent the-edges so as t0 bring the inner face ofthel'ayer substantially Aflush with the inner-face of the ysheet 5 when the parts are united-,theeby form# when the tube is inflated. The layer Q-'need not necessarily be Vof chrome leather though in practice we findthis material eminently desirable, being pliable, yielding, and soft. We could howeverv substitute anyequivalent and preferably non-Woven material capable of resistingpunctures by nails, tac-ks, glass,

land the like, without departing from the nature or spirit of ourV invention.

By .making the inner'tube of `two sections,

i vnamely a dilatable section and a non-dilatlble puncture proof section, the latter being on the side of the tread portion of the tire,

`Welavoid puncturing the rubber sheet or member constituting the Adilatable section, thereby insuring a long vlife for the inflatable tube.v` Obviously," the dilatable inem-l ber 5 cannot be punctured being located ad- ]acent the rim of tl'ie'Wheel, so that neces-l sarilythe non-dilatableseetion which is ad- V ,jacent the tread of the tire must be -inade lpuncture-proof. This We have accomplished bythe disposition of theseveral layers 1, 2,A 3, 4, as describ'ed,'it being understood that any equivalentthereof is contemplated by the .presentinvention Obviously too,"we

do'\not Wish to be restrictedtothe precise arrangement of building up the .several layers, nor to the specific manner of connecting or molding the dilatable member lto the vnon-dilatable sectionv of the tube.

Having described our invention what we claim is: v 4 l. In an inner tube for pneumatic tires,

' a non-dilatable section adjacent the tread ofthe tire comprising an outer layervv of fabric,

' anzi'nn'er layer off bric,l and an intermediate 'an' inner layerof fabric, and an'i'ntermediate pliable non-puncturable layer, anda dilatable section Aconnected to the fabric layers.

v v'2. In'gan inner tube for pneumatictires, a non-dilatable section l'adjacentthe tread of lthe tire comprisingy an outer layer of fabric,

pliable non-puncturable layer free from the .faces of the' said dil-atabl'e member outer fabric layer, and a dlatable section connected to thefabiic layers.

3. In an inner tube for pneumatic tires, alnon-dilatable section adjacent the tread of the tire comprising an outer layer of fabric, an inner layer of fabric, and anintermediate non-puncturable layer, and a dilatable Section cnnneotedto the non-dilatablesec tion and facing the rim ofthe Wheel sup'-v porting the tire. l

4.' An inner tube forfpneuinatic tires, comprising a non-dilatable section Vadjacent the tread of the tire composed of an outer'layer of fabric, an inner layer offabricand.an

intermediate pliable non-puncturable layer,

a dilatable section adjacent vthe'rim of the wheel, and means on the inner face of the inner fabric layer of the non-dilatable sec tion coperating with the dilatable section to make the tube air-tight When inflated.

5. An inner tube for'pneumatic tires comprising a non-dilatable tread section composed of an outer layer of woven fabric, a layer of leather interior thereto but loose therefrom, a layer of Woven fabric interiorto the leather layer and adhering thereto, the side edges of'the fabriclayers extending beyond the side, edges of lthe leather layer, an inner layer or liner of rubber adhering to the last .mentioned fabric layer and extending laterally beyond the ber member adjacent the rim of the Wheel having its side edges abuttingagainst the corresponding edges of the leather layer, the inner face of the dilatable member being secured tothe inner rubber layer of the nondilatable, tread. section',` and the op osite mg secured between the lateral extensions of the fabric layers, and .a woven fabric flap covj- Vering the outer face 'of the dilatablevmember but loosetherefroniythesides of the fla h ing ,secured-to theadjacent sides o outer fabric layer aforesaid.;

non-dilat'able treadsectioncomprising an outer-Woven fabricflayer, a non-puncturable layer ofy non-Woven material interior thereto and loo'se therefrom, a Woven fabriclayer i 6. In an inner tube for-pneumatic tires, a

edgesofsaid fabric layer, Ya dilatable rubsecured to the inner face ofthe non-Woven layer, andan air-tight liner layer covering the inner. face of the last. mentioned woven `fabric'layer.v f

In testimony-whereof We afiix our signaturesin the presence of two witnesses.

'oHAnLEsRp RAWDON. JOHN HEITMANN.

vWitnesses: e

EMIL STAREK,

C. H. CALLoN. 

